How to appeal a denied claim for out-of-network.
When a plan denies a claim as out-of-network — “non-participating provider,” “you can be balance-billed,” “no qualified in-network specialist available,” “carrier’s QPA governs” — the appeal letter is built around the federal No Surprises Act at 42 U.S.C. § 300gg-19 (45 C.F.R. § 149.110 implementing regulations) and the federal IDR portal at 45 C.F.R. § 149.510, layered with the controlling state balance-billing statute in the enrollee’s jurisdiction. The right framework varies by clinical context: emergency and post-stabilization OON services get the strongest federal protections and an in-network cost-share cap, non-emergent OON disputes route through the carrier’s network-adequacy obligation or the federal IDR portal where the carrier’s QPA is challenged, and self-funded ERISA plans layer on the federal claims-procedure rule at 29 C.F.R. § 2560.503-1.
01 · What an OON denial looks like on the EOB
An out-of-network denial — and the No Surprises Act / balance-billing / IDR framework that defeats it.
An out-of-network denial shows up in three recognizable shapes. First, emergency or post-stabilization care rendered at an out-of-network facility or by an out-of-network clinician — an ER admission at a non-participating hospital, an out-of-network radiologist reading an in-network hospital’s imaging, an out-of-network anesthesiologist on an otherwise in-network surgical case. Second, non-emergent OON specialty care where no qualified in-network specialist was reasonably available within the plan’s geographic and appointment-access standards — a rare surgical oncology case, a pediatric subspecialty consult, a complex rheumatology workup. Third, a carrier-paid OON claim at the carrier’s qualifying payment amount (QPA) where the non-participating provider has balance-billed the patient for the residual — the dispute is then over the QPA itself, the IDR-eligibility of the charge, and the member’s right to challenge the carrier’s payment-amount determination under 45 C.F.R. § 149.510.
The federal framework layered on a denied OON claim varies by clinical context and by plan type. For emergency and post-stabilization services, the federal No Surprises Act at 42 U.S.C. § 300gg-19 caps patient cost-share at in-network levels regardless of how the carrier has adjudicated the claim on the EOB — 45 C.F.R. § 149.110 implements the in-network cost-share obligation, and 45 C.F.R. § 149.410 bars the non-participating provider from balance billing in the listed contexts (emergency, post-stabilization, ancillary physicians at an in-network facility, and where the patient lacked meaningful in-network access). For non-emergent OON disputes, the controlling state balance-billing and network-adequacy statute applies to fully-insured plans — California AB-72 at Cal. Health & Safety Code § 1371.30 / Cal. Code Regs. tit. 28 § 1300.67.2, New York DFS Reg. 187 at 11 NYCRR 187, Texas Insurance Code § 1456.001 (Texas Balance Billing Protection), Massachusetts 211 CMR 154.00, NJ P.L. 2018 c. 90 — and the parallel federal IDR portal at 45 C.F.R. § 149.510 opens a payment-determination track for disputes over the QPA where the carrier has paid less than the provider’s billed charge.
A well-built out-of-network appeal letter pins the controlling framework to the clinical context — the NSA in-network cost-share cap for emergency and post-stabilization, the state balance-billing statute and network-adequacy obligation for fully-insured non-emergent specialty access, the federal IDR portal for QPA-challenge disputes — attaches the provider-directory lookup and the appointment-access record to prove the in-network-alternative gap, and frames the patient’s residual as the in-network cost-share amount (so a balance-billed residual above the in-network equivalent goes away). The letter branches on whether the dispute is at first-stage internal appeal (carrier’s clinical / network-adequacy review on the EOB), at the federal IDR portal (45 C.F.R. § 149.510), or at the controlling state external-review channel (N.Y. Ins. Law § 4914 + 11 NYCRR 187 in NY; Cal. Health & Safety Code § 1370.4 + DMHC IMR in CA; Tex. Ins. Code § 1456.001 + TDI complaint in TX).
01 · The three counter-arguments
The NSA / network-adequacy / IDR counter-argument framework — three named grounds the letter must build on.
01
No Surprises Act emergency cost-share cap (42 U.S.C. § 300gg-19, 45 C.F.R. § 149.110)
The patient received emergency services, post-stabilization care, or ancillary services at an in-network facility by an out-of-network clinician — and the federal No Surprises Act caps the patient’s cost-share at in-network levels regardless of how the carrier adjudicated the claim on the EOB. 42 U.S.C. § 300gg-19 sets the federal prohibition on balance billing in these listed contexts, and 45 C.F.R. § 149.110 implements the in-network cost-share obligation on the carrier side. The supporting documentation is the admission record (emergency department note, discharge summary for post-stabilization), the claim form (CMS-1500 / UB-04 with place-of-service and provider NPI), and the carrier’s EOB showing how the claim was adjudicated at OON rates. This is the most common counter-argument because the NSA covers more cases than carriers typically concede on the first adjudication.
02
Network-adequacy dispute — no qualified in-network specialist reasonably available
The plan’s published provider directory does not list a qualified in-network specialist with the requisite training and appointment availability for the prescribed service, in the geographic window the plan’s network-adequacy standards define — a surgical oncology case where the nearest in-network general surgeon is 90 miles away and lacks the subspecialty training for the procedure, a pediatric subspecialty consult where the directory shows no pediatric-trained provider within the appointment-access standard, a complex rheumatology workup where the in-network rheumatologist declined the case. The supporting documentation is the plan’s provider-directory lookup (screenshots dated to the date of service), the appointment-access record (call logs to the listed in-network providers with documented refusals or wait-list times), the treating physician’s clinical letter naming the specialty training the patient requires, and the carrier-published network-adequacy standard under the controlling state law — Tex. Ins. Code § 1457.052 in Texas, the Knox-Keene network-adequacy framework in California, N.Y. Ins. Law § 3241(a) in New York. The dispute is then reprocessing at in-network cost-share or a single-case agreement.
03
Carrier-pricing / reasonable-belief IDR challenge to the QPA
The carrier has paid the OON claim at its Qualifying Payment Amount (QPA), the non-participating provider has balance-billed the patient for the residual above the QPA, and the dispute is over the carrier’s payment-amount determination. The federal IDR portal at 45 C.F.R. § 149.510 — hosted by the Departments of HHS, Labor, and Treasury — opens a payment-determination track where the certified IDR entity considers the carrier’s QPA against the parties’ reasonable-belief factors: the median in-network rate for the same or similar service in the same geographic region, the provider’s training / licensure / experience, the market share of the carrier and the provider, the patient acuity, the teaching status of the facility, and any prior contract history between the parties. The New York DFS Reg. 187 IDR process at 11 NYCRR § 187 runs the same reasonable-belief factors in a state-court-equivalent “baseball-arbitration” framework — the IDR entity picks either the QPA or the provider’s billed charge, no split-the-difference. The member’s right to challenge the QPA rests on (a) the published methodology the carrier used to compute the median in-network rate, (b) the comparable in-network rate data the carrier should have considered, and (c) the provider-side and acuity factors that weigh against the carrier’s published rate.
01 · State balance-billing specifics
Three state regimes that govern a non-emergency or balance-billed OON dispute.
01
California · AB-72 (Cal. Health & Safety Code § 1371.30, Cal. Code Regs. tit. 28 § 1300.67.2)
CA AB-72
California AB-72 codified at Cal. Health & Safety Code § 1371.30 and the implementing regulation at Cal. Code Regs. tit. 28 § 1300.67.2 cap the patient’s cost-share for non-emergency OON services at in-network levels when the enrollee is treated by a non-participating provider at a participating facility — the same in-network-equivalent obligation the federal NSA imposes in emergency contexts, extended by California statute to non-emergent ancillary and facility-based OON services. The appeal cites § 1371.30 directly, attaches the facility status documentation showing the in-network facility designation, and frames the residual balance-bill as a prohibited § 1371.30 charge. Knox-Keene licensee plans (Kaiser Permanente, Health Net, Blue Shield of California, Anthem Blue Cross) layer the DMHC Help Center complaint channel and the Cal. Health & Safety Code § 1370.4 IMR for binding external review.
02
New York · DFS Reg. 187 surprise-bill and IDR (11 NYCRR 187)
NY DFS 187
New York DFS Reg. 187 at 11 NYCRR 187 sets the state surprise-billing and IDR framework for OON disputes, layering on the federal No Surprises Act and the parallel NY Insurance Law provisions. The IDR process applies the same reasonable-belief factors as 45 C.F.R. § 149.510 — median in-network rate, provider training and experience, market share, patient acuity, teaching status, prior contract history — in a baseball-arbitration framework where the certified IDR entity picks either the QPA or the provider’s billed charge, no split-the-difference. NYDFS Consumer Hotline 1-800-342-3736 routes the enrollee to the external-appeal packet and the IDR-initiation flow, with 11 NYCRR 71.4 binding Approved Review Organization (ARO) procedure applying to disputes that escalate to external appeal. The appeal cites 11 NYCRR 187 directly, attaches the published methodology the carrier used for the QPA, and frames the IDR-eligibility of the dispute against the carrier’s payment-amount determination.
03
Texas · Insurance Code § 1456.001 (Texas Balance Billing Protection)
TX 1456.001
Texas Insurance Code § 1456.001 — the Texas Balance Billing Protection — is the state-compliance layer for the federal No Surprises Act, holding Texas fully-insured plans to the in-network cost-share cap and the balance-billing prohibition for emergency services and post-stabilization care at OON facilities, plus ancillary services at in-network facilities. Texas Insurance Code Chapter 1457 provides the parallel network-adequacy obligation for non-emergency OON specialty access (fully-insured TDI-regulated plans). The appeal cites § 1456.001 directly for emergency / ancillary balance-billed contexts and pairs § 1456.001 with § 1457.052 for non-emergent network-adequacy disputes. TDI complaint pathway (1-800-252-3439, tdi.texas.gov) routes the enrollee to the IDR-eligibility determination where the carrier’s QPA is in dispute, with the parallel 28 Tex. Admin. Code § 3.1010 federal-review channel for non-grandfathered self-funded ERISA plans covered by the federal external-review regulation.
01 · ERISA procedural note
For self-funded ERISA plans — the arbitrary-denial standard at 29 C.F.R. § 2560.503-1 plus the federal IDR portal at 45 C.F.R. § 149.510 for balance-billing disputes.
Self-funded ERISA plans — typically larger employer group plans where the employer pays the claims rather than buying insurance from a carrier — run through the Department of Labor’s claims-procedure rule at 29 C.F.R. § 2560.503-1, implementing ERISA § 503 at 29 U.S.C. § 1133. The regulation requires the plan to give the claim a “full and fair review,” and the implementing language at § 2560.503-1(b)(1) prohibits denials that are “arbitrary and capricious.” For emergency and post-stabilization OON claims on a self-funded plan, the No Surprises Act at 42 U.S.C. § 300gg-19 and the implementing 45 C.F.R. § 149.110 still apply — the NSA is a federal consumer-protection statute that preempts ERISA plan terms that conflict with the in-network cost-share obligation. The federal IDR portal at 45 C.F.R. § 149.510 opens a payment-determination track that survives the ERISA plan-document framework because it operates as a parallel federal remedy, not as a plan-document modification — and the carrier’s failure to engage with the IDR-eligibility factors (median in-network rate, provider training, market share, patient acuity, teaching status) on the record is the procedural defect the appeal letter frames.
The arbitrary-denial standard is the lever that distinguishes a denied claim from a denial the plan must defend. Specifically, on a non-emergent OON / network-adequacy dispute, the plan must show (i) that its provider directory was accurate and up to date on the date of service (the directory-accuracy obligation under the controlling state network-adequacy statute, or under the federal standard for non-TDI-regulated plans), (ii) that a qualified in-network specialist with the requisite specialty training was available within the geographic / appointment-access window the plan’s published standard defines, (iii) that the QPA the carrier applied was computed using the methodology the carrier published, and (iv) that the IDR-eligibility factors the certified IDR entity would weigh were disclosed on the claim file. When any of those four are missing, the § 2560.503-1(b)(1) standard is not met on the network-adequacy dispute, and the appeal frames the ask as a procedural-defect reversal under the federal claims-procedure rule — layer the federal IDR portal at 45 C.F.R. § 149.510 in parallel for the QPA-challenge dispute.
01 · Worked sample paragraph
A first-person appeal paragraph that has already survived one round.
Below is a worked survivor-language paragraph — the kind of letter a member writes after a carrier has adjudicated an out-of-network claim at OON cost-share and the non-participating provider has balance-billed the residual. The voice is first-person, the evidence is attached, and the citations frame the request as an NSA in-network cost-share reversal plus an IDR-eligibility determination rather than a re-argument of the underlying coverage decision. The sample subject is a denied in-network cost-share on an OON emergency-department admission at a non-participating facility — a No Surprises Act case where the carrier has applied OON cost-share in violation of 42 U.S.C. § 300gg-19.
Re: Second-stage internal appeal — OON cost-share on emergency services, EOB dated [DATE]
I am writing as the patient and as the party who has previously filed a first-stage appeal of this denial. The plan’s determination dated [DATE] adjudicated the claim at out-of-network cost-share and the carrier refused to engage with the federal No Surprises Act in-network cost-share obligation under 42 U.S.C. § 300gg-19 and 45 C.F.R. § 149.110. The emergency department admission occurred at [FACILITY NAME], a non-participating facility under my plan; the discharge summary dated [DATE] documents an emergency medical condition within the meaning of 45 C.F.R. § 149.410, and the claim form (UB-04) submitted to the carrier shows place-of-service [POS] reflecting the emergency-department context. The first-stage appeal was denied without identifying a controlling reason why the federal No Surprises Act does not apply to the claim, without addressing 45 C.F.R. § 149.110’s in-network cost-share obligation, and without disclosing the methodology the carrier used to compute the Qualifying Payment Amount under 45 C.F.R. § 149.510.
I am submitting additional evidence to satisfy the full and fair review required under ERISA § 503 at 29 C.F.R. § 2560.503-1(b)(1) (where applicable) and the federal No Surprises Act in-network cost-share obligation at 42 U.S.C. § 300gg-19. Specifically: (1) the discharge summary from [FACILITY NAME], dated [DATE], documenting the emergency medical condition that triggered the admission under 45 C.F.R. § 149.410; (2) the claim form (UB-04 / CMS-1500) showing place-of-service and provider NPI; (3) the carrier’s published Qualifying Payment Amount methodology — requested under 45 C.F.R. § 149.510 — to verify the median in-network rate the carrier applied; (4) the non-participating provider’s balance-bill letter, dated [DATE], for the residual above the carrier’s OON payment; and (5) my plan’s provider directory as of [DATE OF SERVICE], confirming that no qualified in-network facility was reasonably available to treat the emergency medical condition in the relevant geographic window. The federal IDR portal at 45 C.F.R. § 149.510 opens a payment-determination track on the QPA dispute in parallel with the appeal — the certified IDR entity will apply the reasonable-belief factors (median in-network rate, provider training, market share, acuity, teaching status) on the record.
I am requesting (a) a reversal of the OON cost-share adjudication and reprocessing at in-network cost-share under 42 U.S.C. § 300gg-19 and 45 C.F.R. § 149.110, (b) a written confirmation from the carrier that the non-participating provider has been notified that balance billing is prohibited under 45 C.F.R. § 149.410, (c) disclosure of the carrier’s published QPA methodology under 45 C.F.R. § 149.510, and (d) initiation of the federal IDR portal process where the provider has filed a balance-bill challenge to the carrier’s QPA. If the plan maintains the denial, I am preserving the state external-review channel in my jurisdiction (N.Y. Ins. Law § 4914 + 11 NYCRR 187 in NY, Cal. Health & Safety Code § 1370.4 + DMHC IMR in CA, Tex. Ins. Code § 1456.001 + TDI complaint in TX, and the parallel foreign-state channel), the 11 NYCRR 187 baseball-arbitration IDR or the equivalent state IDR process in the controlling jurisdiction, and the civil action under ERISA § 502(a) at 29 U.S.C. § 1132(a)(1)(B) on exhaustion of internal and external review.
Cited: 42 U.S.C. § 300gg-19; 45 C.F.R. §§ 149.110, 149.410, 149.510; 29 C.F.R. § 2560.503-1(b), (j)(4), (m); 29 U.S.C. §§ 1133, 1132(a)(1)(B); Cal. Health & Safety Code § 1371.30; 11 NYCRR 187; Tex. Ins. Code § 1456.001.
Identifiers, member IDs, claim numbers, facility names, provider NPIs, and street addresses in the sample paragraph above are placeholders — every name is invented, and only the controlling statute / CFR / USC citations are real (those are public law).
02 · Frequently asked
The No Surprises Act, state balance-billing statutes, and federal IDR portal frameworks that apply to an out-of-network denial.
Cited: 42 U.S.C. § 300gg-19 No Surprises Act · 45 C.F.R. §§ 149.110, 149.410, 149.510 (federal IDR portal) · Cal. Health & Safety Code § 1371.30 (CA AB-72) · 11 NYCRR 187 (NY DFS Reg. 187) · Tex. Ins. Code § 1456.001 (Texas Balance Billing Protection).
Browse by state
Pick your state to see the appeal framework that applies.
Every state has a different agency, timeline, and binding external-review channel — start with yours.
03 · Submit the out-of-network denial
The same OON denial — reprocessed at in-network cost-share with the NSA + federal IDR framing.
Upload the EOB or denial letter, answer the four short intake questions, and Denvow picks the No Surprises Act framework under 42 U.S.C. § 300gg-19 + 45 C.F.R. § 149.110 (for emergency / post-stabilization claims), the network-adequacy statute in the controlling jurisdiction (for non-emergent specialty access disputes where no qualified in-network specialist was reasonably available), or the federal IDR portal at 45 C.F.R. § 149.510 (for QPA-challenge disputes where the non-participating provider has balance-billed the residual) — and the letter branches on whether you are at the first-stage internal appeal, the state external-review channel in your jurisdiction, or the federal IDR initiation flow.
Already in the intake? Pre-selected to “out-of-network” as the Segment-Denial-Reason — answer the rest and submit.
Other denial-reason pages
Denvow is template-and-tooling, not legal counsel. For denials that genuinely need litigation, an ERISA fiduciary complaint, or a state-court remedy, we recommend a licensed attorney in the relevant jurisdiction — and will say so when we see one.